Oracle Java SE 21 Developer Professional : 1z0-830

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Oracle Java SE 21 Developer Professional Sample Questions:

1. Given a properties file on the classpath named Person.properties with the content:
ini
name=James
And:
java
public class Person extends ListResourceBundle {
protected Object[][] getContents() {
return new Object[][]{
{"name", "Jeanne"}
};
}
}
And:
java
public class Test {
public static void main(String[] args) {
ResourceBundle bundle = ResourceBundle.getBundle("Person");
String name = bundle.getString("name");
System.out.println(name);
}
}
What is the given program's output?

A) James
B) JamesJeanne
C) Compilation fails
D) MissingResourceException
E) Jeanne
F) JeanneJames

2. Which of the following can be the body of a lambda expression?

A) Two statements
B) An expression and a statement
C) A statement block
D) Two expressions
E) None of the above

3. Given:
java
public static void main(String[] args) {
try {
throw new IOException();
} catch (IOException e) {
throw new RuntimeException();
} finally {
throw new ArithmeticException();
}
}
What is the output?

A) Compilation fails
B) IOException
C) ArithmeticException
D) RuntimeException

4. Which two of the following aren't the correct ways to create a Stream?

A) Stream stream = new Stream();
B) Stream<String> stream = Stream.builder().add("a").build();
C) Stream stream = Stream.ofNullable("a");
D) Stream stream = Stream.generate(() -> "a");
E) Stream stream = Stream.of();
F) Stream stream = Stream.empty();

5. Given:
java
var sList = new CopyOnWriteArrayList<Customer>();
Which of the following statements is correct?

A) The CopyOnWriteArrayList class does not allow null elements.
B) The CopyOnWriteArrayList class is not thread-safe and does not prevent interference amongconcurrent threads.
C) The CopyOnWriteArrayList class is a thread-safe variant of ArrayList where all mutative operations are implemented by making a fresh copy of the underlying array.
D) Element-changing operations on iterators of CopyOnWriteArrayList, such as remove, set, and add, are supported and do not throw UnsupportedOperationException.
E) The CopyOnWriteArrayList class's iterator reflects all additions, removals, or changes to the list since the iterator was created.

Solutions: